Like most people, when news broke that English party girl Sienna Miller had signed to star in Stephen Sommers' big-screen G.I. Joe flick, I was a little surprised at the choice. Usually, when you think female action stars, Miller probably would not be at the top of the list. Luckily, she seems to be taking the part seriously, and in between champagne cocktails at a pre-BAFTA bash, gave the gossip wags at The Sun a little sneak peak into her preparations to play the infamous Baroness. Miller told the press that, "I've started taking boxing lessons, and I've also had to learn how to fire guns with live ammunition. I'm a baddie, running around kicking everyone while wearing tight, thigh-high boots...I'm getting muscles everywhere."

The official synopsis for the film reads: "From the Egyptian desert to deep below the polar ice caps, the elite co-ed GI JOE team, based from its headquarters The Pit, deploys the latest in next-gen spy and military equipment to fight crooked arms dealer Destro and the growing threat of the mysterious COBRA organization from plunging the world into chaos." In the original Joe stories, Baroness was COBRA Organization's intelligence officer. Serving as a lieutenant to Cobra Commander, Baroness was a dark femme fatale type. In both the comics and the cartoons, she had a romantic relationship with Destro. I guess now that a fellow countryman has been cast as Destro, Sommers might be looking to include the romantic sub-plot.
Casting news has been the order of the day for most of the updates surrounding the film. But now at least we know that the film has finally started, and, hey, at least we got one early peak. Miller also let it slip that she is heading to LA to start working on the film in the next few weeks -- so hopefully all that training will come in handy. G.I. Joe will hit theaters on August 7th, 2009.

[via Comic 2 Film]